I have a question and i hope someone can answer it for me....if someone owns a LWRC M6A2-P Semi Automatic Pistol and a LWRC M6A2 5.56 FDE with 16 inch barrel and they swap out the upper on the pistol to the lower rifle with collapsible stock is that illegal?

Sounds like you'd be creating an SBR. Not sure of exactly what guns you are talking about though.

I remember seeing somewhere that you could swap the lower receiver of an original Bushmaster (Gwinn) rifle with the lower receiver of a Gwinn Arm Pistol (think early '70's) and this would have made an SBR that had to be registered. Sounds somewhat similar.

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